As with most of the reviews, the problem is with the manufacturing design. After about a year, my mini device stopped tuning on. Then when fully recharged, it started to randomly turn itself on, bleeping away, running down the battery again. Then it stopped turning on altogether until I charged it multiple times, only for it to randomly turn itself on again.
When I contacted customer care I got a cut-and-pasted response that I already had access to.
This is not a cheap device with an inbuilt flaw. Unfortunately, like me, it'll probably only be when things start to go wrong that people will pick up on these less positive reviews.